The Destroid Defender EX was a successor to the ADR-04-Mk.X Destroid Defender used by U.N. Spacy during Space War I. Compared to the original, the Defender EX featured roller wheels in its feet for improved mobility. A sensor radome was mounted above its cockpit. The Defender EX's armaments included a pair of 2-barrel railguns mounted as arms, as well a 2-barrel cannon and 3-tube rocket launcher mounted on its torso. The Defender EX was deployed on Earth to defend U.N. Spacy headquarters during the Mardook War in 2092.